Flowers and their Parts 



139 



Fig. 130. — Cvna)idropnipciitaphyUaX>^- Flower 

 with large gynophore, ^^. (From Edmonds 

 and Maiioth's " Elementary Botany for South 

 Africa",) 



frequently called two celled, although they were originally four 

 chambered. Restio and Hibisais have two microsporangia, but 

 in older botanies are called " one celled ". A split occurs in 

 the ridge of each lobe and the anthers are said to dehisce. 



Dehiscence takes place in different ways. The anthers of 

 ]\'atsoina, A/it/iotvza, 

 and Pro tea open the 

 entire length. Cyan- 

 ella and many Heaths 

 open by little pores 

 at the tips. Do you 

 know of any other 

 that open in this way ? 

 Cassytha and Ocutea 

 (Stinkwood) open by 

 little lids upon which 

 the pollen adheres. 



In Adenandra, Barosma, and in some species of Albuca, 

 what appears to be every other stamen bears no anther. 

 In Adenandra they bear honey glands at the tip. Bodies 

 which are in the position of stamens, but which do not form 

 pollen, are called staminodia. 



Stamens may cohere by their anthers (monadelphous), or by 

 their filaments (synandrous or syngenesious) ; they may adhere 

 by their filaments to the petals (epipetalous), or to the sepals 

 (episepalous). 



The following terms refer to the number of stamens and to 

 their position : — 



Pleiostetnonous stamens many or indefinite, twenty or 

 more. 



Diplostemoiwus, two whorls, each of equal number to the 

 petals, the outer whorl alternating with them. 



Ol>diplostemoji02ts, as in diplostemonous, but the outer 

 whorl is opposite or anteposed to the petals. 



The Insertion of the Flower. — The end of the flower- 

 stalk, the receptacle or thalamus, is usually a shortened cone, 

 so that the four whorls of the flower are borne closely together. 



